Vapor supply method in odor sensing system and analysis of transient sensor responses

Self-Assembly of Perfunctionalized β-Cyclodextrins on a Quartz Crystal Microbalance for Real-Time Chiral Recognition

“…The QCM gas-phase pulse-measurement system (Figure ) was built in-house as described previously with some modifications. , Briefly, the measurement system was made up of a vaporization pad that allows microscale enantiomeric samples to be evaporated and a thermostated flow cell with a volume of 66.0 cm 3 to house a QCM and maintain at an operating temperature at 25 ± 0.1 °C. Predried pure nitrogen was used as carrier gas.…”

Reduction of the Measurement Time by the Prediction of the Steady-State Response for Quartz Crystal Microbalance Gas Sensors

“…In particular, the transient response can be useful for obtaining information on the interaction between the sensing film and the gas molecules, for discriminating odours and vapours, and for predicting the steady-state response [ 14 ]. Several studies have been performed using a model of the transient response of QCM sensors, such as odour classification [ 28 , 29 ], studies of different sensing films in order to separate and classify odour samples [ 30 ], and a direct study of the transient response curve using multi-exponential models [ 31 , 32 ]. However, to the best of our knowledge, there are no studies on the use of a transient response model to predict the steady-state response of QCM gas sensors exposed to volatile organic compounds, with the purpose of reducing the measurement time.…”

Higher-Order Chemical Sensing

“…Furthermore, in the case of dynamic headspace analysis, a steady-state response may not even be attainable, since the volatiles in the headspace may be depleted faster than they can be released from the sample. In these cases, the transient response to a short concentration pulse, as illustrated in Figure a, may provide sufficient information 31 Gas sensor transient response to a short odor pulse (a).…”